Assignment gets optimized away

[Alexander Praetorius]

/******************************************************************************

    Sloppy description

      - No problem in ['node 0.12', 'firefox']

      - Fails in ['iojs', 'new chrome']

******************************************************************************/

// PREPARE

var defaultKeys = { '0': '', '1': '', '2': '', '3': '' };

var ROUNDS = 3;

// RUN

for (var idx=0; idx<ROUNDS; idx++) {

    

  // BUG: assignment gets optimized away for ROUNDS > 2

  var keys = { '0': '', '1': '', '2': '', '3': '' };

  // ASSERT

  assertDeepEqual(keys, defaultKeys);

  for(var i=0; i<3; i++) {

    keys[i] = 'foobar';

  }

}

/******************************************************************************

  ASSERT deep equal

******************************************************************************/

function assertDeepEqual (keys, defaultKeys, msg) {

  if (keys[0] === defaultKeys[0] &&

      keys[1] === defaultKeys[1] &&

      keys[2] === defaultKeys[2] &&

      keys[3] === defaultKeys[3]) {

  } else {

    keys        = JSON.stringify(keys,null,2);

    defaultKeys = JSON.stringify(defaultKeys,null,2);

    console.debug(keys+' === '+defaultKeys);

  }

}

[Jakob Kummerow]

This is crbug.com/466993, fixed in V8 4.4+.

(And no, nothing is "optimized away", it's just a bug.)

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